/ftp/cats/A+A/538//A74



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J/A+A/538/A74       Massive binaries in Cepheus OB2/3 region     (Peter+, 2012)
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	tablea1.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/A+A/538/A74
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Beginning of ReadMe : J/A+A/538/A74 Massive binaries in Cepheus OB2/3 region (Peter+, 2012) ================================================================================ Massive binaries in the Cepheus OB2/3 region. Constraining the formation mechanism of massive stars. Peter D., Feldt M., Henning T., Hormuth F. <Astron. Astrophys., 538, A74 (2012)> =2012A&A...538A..74P ================================================================================ ADC_Keywords: Clusters, open ; Stars, double and multiple ; Spectral types Keywords: binaries: close - stars: formation - stars: massive Abstract: Two different formation scenarios for stars of masses larger than 10M_sun_ exist. Although simulations within both scenarios are capable of producing stars up to the highest observed masses, the relevance of the two formation scenarios for massive star-formation is not yet clear. We aim to detect companions to massive stars to constrain the binary parameters of the multiple systems. These findings will help to constrain the formation of massive stars. Description: We performed z'-band observations of massive and intermediate-mass stars in the Cep OB2/3 associations with the Lucky imaging camera AstraLux on the 2.2m telescope of the Calar Alto observatory. The analysis aimed at detecting binary systems with separations out to 2.2' ( 1700AU), the inner limit depending on the contrast. The maximum contrast of 7mag in z' (corresponding to a mass contrast of 17:1 versus an O9V primary) requires a minimum separation of 0.7' ( 550AU).